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arXiv 1109.2164hep-phastro-ph.HE
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非对称暗物质的对称性再生

Regenerating a Symmetry in Asymmetric Dark Matter

Matthew R. Buckley, Stefano Profumo

摘要:

不对称的暗物质理论一般允许质量项导致粒子-反粒子混合。因此,在宇宙的年龄中,暗物质可以从纯粹的非对称配置振荡为粒子和反粒子的对称混合,从而允许对湮没过程。此外,需要有效地耗尽原始热(对称)组件一般需要大的湮灭率。我们表明,除非某些对称性完全禁止暗物质粒子-反粒子混合,否则对于大范围的质量,对于几乎任何短于宇宙年龄的振荡时间尺度,非对称暗物质都被有效地排除。

英文摘要:

Asymmetric dark matter theories generically allow for mass terms that lead to particle-antiparticle mixing. Over the age of the Universe, dark matter can thus oscillate from a purely asymmetric configuration into a symmetric mix of particles and antiparticles, allowing for pair-annihilation processes. Additionally, requiring efficient depletion of the primordial thermal (symmetric) component generically entails large annihilation rates. We show that unless some symmetry completely forbids dark matter particle-antiparticle mixing, asymmetric dark matter is effectively ruled out for a large range of masses, for almost any oscillation time-scale shorter than the age of the Universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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